JP2008073725A - Die-cast molten metal supply device and method - Google Patents

Abstract

Disclosed is a die-cast molten metal supply device that reliably supplies a lubricant.
In a die-cast molten metal supply device for injecting molten metal from an injection sleeve 7 into a cavity 6 formed on boundary surfaces 4a and 5a of a pair of molds 4 and 5, a piston 7b of the injection sleeve 7 is provided. Automatic spray mechanism having a lubricant supply means 10 for ejecting a powdery lubricant and air to a sliding surface on which the sliding member slides, and a release agent supply means 9 for supplying a liquid release agent to the boundary surface 8, wherein when the release agent supply means ejects the release agent, the lubricant supply means ejects air and prevents the release agent from entering the lubricant supply means. This is a die-cast lubricant supply device.
[Selection] Figure 1

Description

  The present invention relates to a die-cast molten metal supply apparatus and method.

Die-casting is a method of manufacturing a product having a predetermined shape by supplying molten metal into an injection sleeve and injecting the molten metal into a mold by a plunger tip sliding inside the sleeve (Patent Document 1). reference). In order to manufacture high quality products using die casting, the injection conditions become high speed, the load on the injection sleeve and plunger tip is large, and the sliding surface of the injection sleeve and plunger tip wears and galling occurs. It becomes easy. For this reason, a powdery or granular lubricant has been conventionally applied to the sliding surface. Further, after injection of the molten metal into the cavity, a liquid mold release agent is applied to the cavity surface in order to facilitate the removal of the product.
Japanese Patent Laid-Open No. 5-285622

  However, in the case where the application of the lubricant and the release agent is covered by a single device, the spray ports are arranged adjacent to each other, and the lubricant spray port is caused by the moisture of the liquid release agent. The problem of clogging occurs.

  Accordingly, an object of the present invention is to provide a die-cast molten metal supply device capable of reliably supplying a lubricant.

  The present invention provides a die-cast molten metal supply device for injecting molten metal from an injection sleeve into a cavity formed on a boundary surface between a pair of molds, and a powdery surface on a sliding surface on which a piston of the injection sleeve slides. An automatic spray mechanism having a lubricant supply means for ejecting the lubricant and air and a release agent supply means for supplying a liquid release agent to the boundary surface, and the release agent supply means is a release agent. In the die-casting lubricant supply device, the lubricant supply means ejects air when the agent is ejected to prevent the release agent from entering the lubricant supply means.

  Further, the present invention provides a die-cast molten metal supply device for injecting molten metal from an injection sleeve into a cavity formed on a boundary surface between a pair of molds, wherein a lubricant supply means for supplying a lubricant includes the injection When the powdery lubricant and air are ejected onto the sliding surface on which the piston of the sleeve slides, the release agent supply means for supplying the liquid release agent to the boundary surface ejects air, and the lubricant A die-casting lubricant supply method characterized in that a mold release agent is prevented from entering the supply means.

  In the present invention, since the lubricant supply means ejects air when the release agent is ejected, moisture of the release agent does not enter the lubricant supply means, and the lubricant is prevented from solidifying and being unable to be ejected. Can do.

  1 and 2 are configuration diagrams for explaining a first embodiment of the present invention. FIG. 1 shows a state before the molten metal is injected (when the release agent is sprayed), and FIG. 2 shows after the molten metal is injected. Shows the state.

  In the figure, reference numeral 1 denotes a casting machine, in which a fixed platen 2 for fixing a fixed mold 4 and a movable platen 3 for fixing a movable mold 5 are disposed so as to be capable of relative movement. A fixed mold 4 is fixed at the position, and a movable mold 5 is disposed on the movable platen 3 so as to oppose the fixed mold 4. The movable platen 3 can be moved back and forth with respect to the fixed platen 2 by an actuator (not shown) such as a hydraulic cylinder, and the movable mold 5 is brought into close contact with the fixed mold 4. In the state where the fixed mold 4 and the movable mold 5 are integrated, the boundary surfaces 4a and 5a are uneven so that the cavity 6 which is a space portion into which the molten metal is injected is formed in a predetermined shape. Is formed.

  The injection sleeve 7 passes through the fixed platen 2 and the fixed mold 4, and the opening at the tip thereof opens at the boundary surface 4 a of the fixed mold 4. The injection sleeve 7 is formed in a cylindrical shape, and is provided with a pouring gate 7 a for injecting molten metal into the sleeve 7 and a piston 7 b slidable in the sleeve 7. The piston 7b can be advanced and retracted by an actuator (not shown) such as a hydraulic cylinder. The piston 7b moves as the hydraulic cylinder expands and contracts, and the molten metal is pushed into the cavity 6 by the movement of the piston 7b. ing.

  An automatic spray device 8 for spraying a liquid release agent is installed on the boundary surfaces 4a and 5a of the molds 4 and 5, and the automatic spray device 8 has a predetermined number of release agent nozzles 9 for spraying the release agent. Be placed. The automatic spray device 8 is configured to be movable so that the release agent is sprayed over the entire boundary surface. The mold release agent is a liquid mold release agent that is sprayed toward the boundary surfaces 4a and 5a, particularly the cavity 6 into which the molten metal is injected, and when the molten metal is cooled and taken out, the gold is removed. The molds 4 and 5 can be easily peeled off and taken out.

  Further, the automatic spray device 8 is provided with a lubricant nozzle 10 for spraying a powdery lubricant into the sleeve 7. The lubricant nozzle 10 sprays the lubricant onto the sliding surface 7c of the piston in the sleeve 7 at a position facing the sleeve 7, so that the sliding state between the sleeve 7 and the piston 7b is maintained well. The lubricant nozzle 10 is configured to be able to select the ejection of air in addition to the lubricant, and is selected so that air is ejected from the lubricant nozzle 10 when the release agent is sprayed from the release agent nozzle 9. Is done.

  FIG. 3 is a piping diagram for supplying the lubricant to the lubricant nozzle 10. The lubricant pipe 11 includes a lubricant pipe 11a that supplies a lubricant and an air pipe 11b that supplies air.

  The lubricant pipe 11a is a pipe to which the lubricant nozzle 10 is connected at the tip, and is provided with a regulator 12a for adjusting the pressure of the lubricant pipe 11a and an electromagnetic control valve 13a for controlling the opening and closing of the lubricant pipe 11a. The Further, on the upstream side, a tank pipe 11 c connected to the lubricant tank 15 is connected to supply the lubricant to the lubricant nozzle 10.

  The air pipe 11b is provided by bypassing the regulator 12a for adjusting the pressure of the lubricant pipe 11a and the electromagnetic control valve 13a for controlling the opening and closing of the lubricant pipe 11a, and the air pipe 11b is provided for pressure adjustment. Regulator 12b and an electromagnetic control valve 13b for opening and closing the air pipe 11b are disposed. The operation of the regulators 12a and 12b and the electromagnetic valves 13a and 13b is controlled by the controller 20.

  The lubricant pipe 11a and the air pipe 11b are connected to a common air supply source 14, and the lubricant pipe 11a and the air pipe 11b merge on the downstream side of the tank pipe 11c. Note that an electromagnetic control valve 16 that controls the supply of the lubricant to the lubricant pipe 11 is installed in the tank pipe 11c, and the controller 20 controls the opening and closing thereof.

  The air pipe 11b may be used for supplying air for air blow for the purpose of cleaning the inside of the lubricant pipe 11 after supplying the lubricant. Further, the regulators 12a and 12b and the electromagnetic control valves 13a, 13b and 16 are controlled by the controller 20.

  Therefore, when spraying the lubricant, the controller 20 opens the electromagnetic control valve 13a of the lubricant pipe 11a and the electromagnetic control valve 16 of the tank pipe 11c, closes the electromagnetic control valve 13b of the air pipe 11b, and uses the regulator 12a. The pressure is adjusted and the lubricant is sprayed together with air from the lubricant nozzle 10 onto the sliding surface 7 c of the sleeve 7. When spraying the release agent from the release agent nozzle 9, the electromagnetic control valve 13b of the air pipe 11b is opened, and the electromagnetic control valve 13a of the lubricant pipe 11a and the electromagnetic control valve 16 of the tank pipe 11c are closed. Then, the pressure is adjusted by the regulator 12b, and air is sprayed from the lubricant nozzle 10. Further, at the time of air blow, the electromagnetic control valve 13b of the air pipe 11b is opened, the electromagnetic control valve 13a of the lubricant pipe 11a and the electromagnetic control valve 16 of the tank pipe 11c are closed, and the pressure is adjusted by the regulator 12b, and the lubricant Air is sprayed from the nozzle 10.

  Next, the operation will be described with reference to the flowchart of FIG. This flowchart is implemented by the controller 20, and is started, for example, when an operator turns on a predetermined switch.

  First, in step S1, the position of the automatic spray device 8 is confirmed using a position detection sensor (not shown) or the like. If the position of the automatic spray device 8 is set to a predetermined initial position, the process proceeds to step S2, and if not, the process proceeds to step S3. After returning to the initial position, the process proceeds to step S2.

  In step S2, the air supply source 14 is activated, the electromagnetic control valve 13a of the lubricating oil pipe 11a and the electromagnetic control valve 16 of the tank pipe 11c are closed, and the electromagnetic control valve 13b of the air pipe 11b is opened. By this control, only air is ejected from the lubricant nozzle 10.

  In subsequent steps S4 and S5, application of a release agent to the boundary surfaces 4a and 5a is started in a state where air is ejected from the lubricant nozzle 10. The movement of the automatic spray device 8 is controlled so that the release agent is uniformly applied to the predetermined boundary surfaces 4a and 5a.

  In step S6, it is determined from the output of the position detection sensor that the automatic spray device 8 has reached the predetermined end position. If it is in the end position, the movement of the automatic spray device 8 is ended in step S7, and the subsequent steps S7, S In step S8, the release of the release agent and air is stopped.

  In step S9, the electromagnetic control valve 13a of the lubricating oil pipe 11a and the electromagnetic control valve 16 of the tank pipe 11c are opened, the electromagnetic control valve 13b of the air pipe 11b is closed, and the lubricant is injected from the lubricant nozzle 10. 7 is sprayed on the sliding surface of the piston 7c. Therefore, it is desirable that the end position of step S6 is a lubricant ejection position.

  In step S10, the ejection of the lubricant is finished, and in step S11, the automatic spray device 8 is moved to the initial position, and the control is finished.

  Thus, in this embodiment, when the release agent is ejected from the release agent nozzle 9 of the automatic spray device 8, air is simultaneously ejected from the lubricant nozzle 10, so the moisture of the release agent. Accordingly, it is possible to prevent moisture from the release agent from entering the lubricant pipe 11a and solidify the powdery or granular lubricant to block the inside of the lubricant pipe 11a and the nozzle of the lubricant nozzle 10.

  In the control content described above, the control is started by the operator's switch operation. However, the control content may be automatic control, or the control content is premised on the control from the preset initial position to the end position. The control may be a start from an arbitrary position and an end at an arbitrary position.

  FIG. 5 is another piping diagram for supplying the lubricant to the lubricant nozzle 10. This pipe is characterized in that the air blow pipe 11d and the air pipe 11e are independently formed as compared with the configuration of FIG.

  The lubricant pipe 11 includes a lubricant pipe 11a for supplying a lubricant to the lubricant nozzle 10, an air blow pipe 11d for supplying air blow air, and an air pipe 11e.

  The lubricant pipe 11a is a pipe to which the lubricant nozzle 10 is connected at the tip, and is provided with a regulator 12a for adjusting the pressure of the lubricant pipe 11a and an electromagnetic control valve 13a for controlling the opening and closing of the lubricant pipe 11a. The Furthermore, a tank pipe 11 c connected to the lubricant tank 15 is connected to the upstream side, and the lubricant is supplied from the lubricant nozzle 10 to the sleeve 7.

  The air blow pipe 11d is provided to bypass the regulator 12a and the electromagnetic control valve 13a of the lubricant pipe 11a, and the air blow pipe 11d controls the opening and closing of the regulator 12d for pressure adjustment and the air blow pipe 11d. An electromagnetic control valve 13d is arranged.

  Further, a tank pipe 11c connected to the lubricant tank 15 is connected to the downstream side of the joining portion of the lubricant pipe 11a and the air blow pipe 11d. An electromagnetic control valve 16 for controlling the supply of the lubricant to the lubricant pipe 11a is installed in the tank pipe 11c.

  Further, the air pipe 11e is disposed so as to connect the upstream side of the regulator 12a of the lubricant pipe 11a and the downstream side of the joining portion of the tank pipe 11c. Air is supplied to the air pipe 11e from an air supply source 14 which is common to the lubricant pipe 11a and the air blow pipe 11d, and a regulator 12c for adjusting the pressure and an electromagnetic control valve for controlling the opening and closing of the air pipe 11e. 13c and a check valve 17 for preventing the lubricant from flowing back from the lubricant pipe 11a to the air pipe 11e.

  The operation of the regulators 12a, 12d, and 12c and the electromagnetic control valves 13a, 13d, and 13c installed in the pipes 11a, 11d, and 11e is controlled by the controller 20.

  As described above, the air blow pipe 11d and the air pipe 11e are formed independently, and each is provided with the regulators 12c and 12d. Therefore, the air blow is effectively performed by adjusting the air pressure to the optimum air blow. In addition, it is possible to adjust the supply pressure of air performed when supplying the release agent to an optimum pressure.

  The present invention is not limited to the embodiment described above, and various modifications and changes can be made within the scope of the technical idea, and it is obvious that these are equivalent to the present invention.

It is a block diagram (before molten metal injection | pouring) of 1st Embodiment. It is a block diagram (after molten metal injection | pouring) similarly. It is a piping diagram which supplies a lubricant. It is a flowchart which supplies a lubricant and a mold release agent. It is another piping diagram which supplies a lubricant.

Explanation of symbols

1: casting machine 4: fixed mold 4a: boundary surface 5: movable mold 5a: boundary surface 6: cavity 7: injection sleeve 7a: gate 7b: piston 7c: sliding surface 8: automatic spray device 9: mold release Agent nozzle 10: Lubricant nozzle 11: Lubricant pipe 11a: Lubricant pipe 11b: Air pipe 11c: Tank pipe 11d: Air blow pipe 11e: Air pipes 12a-12d: Regulators 13a-13d: Electromagnetic control valve 14 : Air supply source 15: Tank 16: Electromagnetic control valve 17: Check valve 20: Controller

Claims (6)

In a die-cast molten metal supply device for injecting molten metal from an injection sleeve into a cavity formed on the boundary surface between a pair of molds,
Lubricant supply means for ejecting powdery lubricant and air to the sliding surface on which the piston of the injection sleeve slides;
An automatic spray mechanism having a release agent supply means for supplying a liquid release agent to the boundary surface;
When the release agent supply means ejects the release agent, the lubricant supply means ejects air to prevent the release agent from entering the lubricant supply means. Lubricant supply device. The lubricant supply means includes a nozzle for supplying a lubricant to the sliding surface, a lubricant pipe connected to the nozzle and supplying a lubricant provided in parallel, and an air pipe for supplying only air. An on-off valve that opens and closes each of the lubricant pipe and the air pipe,
When the release agent supply means supplies the release agent to the boundary surface, the lubricant pipe on / off valve is closed, the air pipe on / off valve is opened, and air is supplied from the nozzle. The die-cast molten metal supply device according to claim 1, wherein The lubricant supply means includes an air supply source for supplying air to the lubricant pipe and the air pipe,
The release agent supply means includes a nozzle for supplying a release agent to the boundary surface, a release agent pipe connected to the nozzle, and an on-off valve for opening and closing the release agent pipe.
The lubricant pipe is connected to a tank pipe having an on-off valve that leads to a lubricant tank that stores the lubricant,
Close the opening and closing valves of the release agent piping and the air piping, open the opening and closing valves of the lubricant piping and the tank piping, and supply the lubricant from the nozzle of the lubricant supply means from the air supply source. 3. The die-cast molten metal supply device according to claim 2, wherein the die-cast molten metal is ejected onto the sliding surface together with air. The lubricant pipe includes an air blow pipe that bypasses the open / close valve of the lubricant pipe, and an open / close valve that opens and closes the air blow pipe.
When the lubricant supply means supplies lubricant to the sliding surface, the air pipe, the tank pipe, and the air blow pipe open / close valve are closed, and the lubricant pipe open / close valve is opened, The lubricant is ejected from the nozzle of the lubricant supply means to the sliding surface together with the air from the air supply source,
Closing the on-off valve of the lubricant pipe, the air pipe, and the tank pipe, opening the on-off valve of the air blow pipe, and blowing out air from the air supply source from the nozzle; 4. The die cast molten metal supply device according to claim 3, wherein the inside is cleaned.   Pressure adjusting valves are provided in the air blow pipe and the air pipe, respectively, and a pressure at which air is ejected from the air pipe through the nozzle when the release agent supply means supplies the release agent to the boundary surface. 5. The die-cast molten metal supply device according to claim 4, wherein the pressure at which air is ejected from the air blow pipe through the nozzle during air blow is independently controlled. In a die-cast molten metal supply device for injecting molten metal from an injection sleeve into a cavity formed on the boundary surface between a pair of molds,
When the lubricant supply means for supplying the lubricant jets powdered lubricant and air onto the sliding surface on which the piston of the injection sleeve slides,
A release agent supply means for supplying a liquid release agent to the boundary surface ejects air,
A die-cast lubricant supply method, wherein a release agent is prevented from entering the lubricant supply means.